Drying apparatus



Aug. 30,A 193s. J. Em.

DRYING APPARATS' Filed May 22, 1936 2 Sheets-Sheet 1 INVENTOR Lgs-EPH Erw- I BY v ATTORNEYS Aug.3o,193s. J. Em 4:2,128,697

DRYING APPARATUS Filed May 22, 193e 2 'sheets-sneer 2 2% n?" T l INVENTOR QS l v i i SEP/l Err/ Patented Aug. 30, 1938 UNITED STATES Pli'rlalsnl ori-*ic DRYING APPARATUS Joseph Ettl, Plainfield,

N. J., assignor to Potdevin Machine Company, Brooklyn, N. Y., a corporation of New York Application May 22, 1936,y Serial No. 81,251

4 Claims.

' 5 drying or heating articles or material passed through the ovens on conveyors.

The present invention has for one of its objects `the provision of a device of the character indicated comprising a novel arrangement of parts n whereby complete and uniform drying or heating 'of the articles or material is readily accomplished. Further objects of the present `invention will be manifest from the following detailed description and the accompanying drawings, in which I5 drawings: l

Fig. 1 isa plan view of my improved device partly broken away to expose the interior construction; y

Fig. 2 is a sectional View on line 2-2 of Fig. 1;

Fig. 3 is a sectional view on line 3-3 of Fig. 1;

Fig. 4is a sectional view on line 4--4 of Fig. 3;

Figs. 5 and 6 are, respectively, plan and sectional views of amodied form of heat generating chamber.

Referring to the drawings in detail, I designates a heat chamber wherein air is heated, the heated air beingpasse'd to a drying chamber or ."oven 2 which is in communication with the heat chamber I. These chambers maybe supported on girders or platform v3 suspended from a ceiling 4 by means of struts 5 or supported in any other suitable manner. r

The heat chamber I has a combustion compartment 6 provided with a plurality of burners 1. The roof or top wall R of the combustion compartment is shaped to provide a plurality of lues 9, 9, I0, II and I2 directlyl above each burner.

Within the heat chamber I is a pair of spaced walls I3 and I4 extending horizontally and cornmunicating at one side of the chamber with a pair of vertical walls I5 and I6 and at the other side with another pair of vertical walls II and I8. The walls I6 and I8 are provided with exhaust pipes or ducts I9 and 20, respectively.

'I'he central flue I0 of the group of iiues above mentioned extends above the horizontal wall I4 and is provided with laterally extending flues or conduits Ill extending into the space between the walls I3 and I4.

The upper ends of the flues 3, 9, ii and I2 have short pipes 26 projecting upwardly into this same space.' It is through these pipes or conduits Ill' and 26 that the products of combustion pass into a compartment formed by the said spaced walls I3 and I4, the products of combustion in this compartment passing downwardly between the vertical spaced walls I5, .I6 on one side and II, I8 on the other side and through the exhaust pipes I9 and 20. It will be appreciated that it would not be delsirable to utilize the products of .combustion in the drying chamber or ovenv 2 due to the gases and impurities it contains, consequently the exhaust ducts IS and 20 may lead to waste or if desired may be recirculated in the heat chamber 6;

The air which is employed and utilized in the drying chamber` or oven is fresh clean air. which is heated by circulating the same in contact with the outside walls of the iiues 8, 9,10, II and I2 and the walls I3, I6 and II of the heat compartment, as will be described presently.

Extending downwardly from the Wall I4 between the fiues 8 and 9 and II and I2 I provide bafiles 22 and 23, respectively. I also provide baffles 20 and 2| extending downwardly from the top wall 25 of the chamber I between the iiues 9 and I0 and the fiues Il) and II, respectively. The baffles 20 and 2I are provided with openings 24 adjacent their upper ends to accommodate the laterally extending flues I0', as will be seen from Fig. 1. l

The drying air is recirculated from the drying chamber or oven by means of a blower 30 driven by a motor 3l. lThis blower is located in a blower housing 32 which communicates. with the heating chamber through a conduit formed `by vertical walls 33 and 34 which communicates' with the intake conduit 35 shown in Fig. 4. An auxiliary air inlet 36 is located in this intake conduit 35 ,for they admission of fresh auxiliary airl to the heating chamber. This inlet iscontrolled by a manually operated damper 31.

The air entering the intake conduitv travels downwardly between the baffles 20 `and 2I where the same is divided by theA flue I0 so that part will.

ber, as viewed in Fig. 4. v l

This air will pass in a staggered path between the downwardly extending baflies 22 and 23 and the upwardly extending flues 8, 9, II and I2 in the direction of the arrows shown in Fig. 4, the air on one side passing upwardly between the walls I6 and 40 and on the other side between the walls I8 and 4I to outlet conduit 42 (shown in Fig. 1) which in turn communicates with the drying chamber 2.

The drying chamber 2 receives the heated air from the heating chamber through the outlet conduit 42 as just described. This conduit comflow to the right and part to the left of the chammunicates with a longitudinally extending'conduit 50 having a plurality of spaced openings 5I in the bottom wall or partition 52 thereof. Be-

low the partition 52 is another Wall or partition 53. The space formed by the partitions 52 and 53 I shall call the equalizing chamber inasmuch as the air is evenly distributed therein, as will be described presently. The partition 53 has a plurality of transversely extending spaced slots 54 formed therein.

The air passing from the outlet conduit 42 enters the space between the Walls or partitions 52 and 53 through the spaced openings 5I which serve to distribute the air evenly. The air passes from this space to the drying compartment or oven 58 through the slots 54, each of which has a pair of flanges supporting screens 55 which further evenly distribute the air before the same is directed upon articles on the conveyor 56 which is located below the wall 53.

After the heated air passes the conveyor it is drawn through conduits 60 and 6I back to the blower housing 32 where it is again circulated.

It will be appreciated from the foregoing that I have provided a structure wherein the air to be treated is circulated in a long irregular path in close contact with heated flues and baiiles and is thence passed to an equalizing chamber Where the same is equalized or evenly distributed before application to the articles being treated, and finally recirculated.

The modied form of heating chamber illustrated in Figs. and 6 likewise provides a long irregular path for the air being heated. In this form the air enters the chamber through inlet conduit 1U and passes around flues 1I, 12, 13, 14 and 75 and thence to the drying chamber through outlet conduit 16, as in the form shown in Figs 1 to 4, inclusive.

This form is also provided with burners 16, 11, 18, 19 and 80 for the flues 1|, 12, 13, 14 and 15, respectively.

The products of combustion from the ilues pass through the conduit 80 formed by the horizontal spaced walls8l and 82 to the vertical spaced walls 83 and 84 and out through exhaust outlet 85.

It is to be understood that various changes and modifications may be made in the structure herein illustrated and described without departing from the spirit and scope of my invention.

What I claim is:-

1. In apparatus of the class described including an external heater, a drier comprising in combination an inlet for admitting heated air from said heater to the drier, a partition in said drier dividing the drier into two compartments disposed in superimposed relation, said partition being provided with a plurality of slots, a screen adjacent each of said slots, thereby to provide an equalizing chamber and a drying chamber with the equalizing chamber immediately adjacent the heated air inlet, means for supporting articles in the drying chamber, said slots extending transversely of the article supporting means, and

means for circulating the heated air through said transverse slots and screens and past the articles carried by said supporting means.

2. In apparatus of the class described including an external heater, a drier comprising in combination a longitudinally extending heated air duct for admitting heated air from said heater to said drier, a conduit at an angle to said duct, said duct communicating with said conduit intermediatey the ends of the conduit, said conduit being provided with a plurality of openings in its lower wall, a partition in said drier dividing the same into two compartments, said partition being provided with a plurality of slots thereby to provide an equalizing chamber and a drying chamber with the equalizing chamber immediately adjacent the openings in said conduit, means for supporting articles in the drying chamber, said slots extending transversely of the article supporting means, and means for circulating heated air through said openings and slots and into contact with the articles carried by said support-ing means.

3. In apparatus of the class described including an external heater, a drier comprising in combination a longitudinally extending heated air duct for admitting heated air from said heater to said drier, a conduit at an angle to said duct, said duct communicating with said conduit intermediate the ends of the conduit, said conduit being provided with a plurality of openings in its lower wall, a partition in said drier dividing the same into two compartments, said partition being provided with a plurality of slots thereby to provide an equalizing chamber and a drying chamber with the equalizing chamber immediately adjacent the openings in said conduit, means for supporting articles in the drying chamber, said openings and said slots extending transversely of the article supporting means, and means for circulating heated air through said openings and slots and into contact with the articles carried by said supporting means.

4. In apparatus of the class described including an external heater, a drier comprising in combination a longitudinally extending heated air duct for admitting heated air from said heater to said drier, a conduit at an angle to said duct, said duct communicating with said conduit intermediate the ends of the conduit, said conduit being provided with a plurality of openings in its lower wall, a partition in said drier dividing the same into two compartments, said partition being provided with a plurality of transverse slots, a screen for each of said slots, thereby to provide an equal- 

